I grew up listening to them in the 70s, when the RAAF had a radio station (RRB) in Butterworth, Malaysia.

Then it was in July 1980, I managed to catch them in Kitchener, Ontario on their NA tour. Bon Scott had died, they had an album out (Back In Black) and a new singer.
Quite a gig, and loud. . and that bell..... Malcolm laid down immaculate precision tooled riff after riff after riff..

Happened to be watching Johnny Carson on night when Mel Tillis was a guest. He was a favorite of Johnny's.

At the time he and Johnny owned V-Tailed Bonanza airplanes. Mel was telling the story of coming into Teterboro airport in N. New Jersey. In his best stutter he said that before he could ask for landing instructions in NJ, he was in Boston. Johnny, myself and untold numbers of watchers fell on the floor laughing. My best Mel Tillis memory.